What's suddenly taking forever is opening a post from the People Hub. Used to be pretty quick. Pretty sure the last Twitter update did it, as after the update you can no longer open an individual tweet within the People Hub. It instead opens the Twitter app. Very annoying.

Happened to me after updating Windows insider app this morning. Tried switching kids corner on and it told me that I have lockscreen app activated even tough I don't. Anyway, kids corner trick done the job for me. It seems that problem is somehow related to Windows insider app after yesterday update. I am using 930.

Well with the Tetra app you have a unregistered button so even if you had it and then uninstalled it the issue of the long resuming stays there. You need to reinstall, then unregister the app and then uninstall. Anyway that was my issue now my phone is back to normal.